Top companies in London

Europe's largest fintech and AI hub by capital deployed and exits.

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Ranked by current headcount across companies headquartered in London. Refreshed daily.

1
EY· London, England, United Kingdom
EY is building a better working world by creating new value for clients, people, society, the planet, while building trust in the capital markets.Enabled by data, AI and advanced technology, EY teams help clients shape the future with confidence and develop answers for the most pressing issues of today and tomorrow.EY teams in more than 150 countries work across a full spectrum of services in assurance, consulting, tax, strategy and transactions, strengthened by sector experience and diverse ecosystem partners. Find out more about the EY global network: http://ey.com/en_gl/legal-statement
- 409.6k employees
- Founded 1989
2
PwC· London, England, United Kingdom
At PwC, we help clients drive their companies to the leading edge. We’re a tech-forward, people-empowered network with more than 370,000 people in 149 countries. Across audit and assurance, tax and legal, deals and consulting we help build, accelerate and sustain momentum. Find out more at www.pwc.com.PwC: Audit and assurance, consulting and tax servicesPwC refers to the PwC network and/or one or more of its member firms, each of which is a separate legal entity. Content on this page has been prepared for general information only and is not intended to be relied upon as accounting, tax or professional advice. Please reach out to your advisors for specific advice.
- Grant
- 300.1k employees
- Founded 1998
3
UK Civil Service· London Colney, England, United Kingdom
The UK Civil Service implements the policy of the Government of the day and delivers crucial public services.
- 237.9k employees
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4
Shell· London, England, United Kingdom
Shell is a global group of energy and petrochemical companies, employing 96,000 people across 70+ countries. We serve around 1 million commercial and industrial customers, and around 33 million customers daily at our Shell-branded retail service stations.Our purpose is to power progress together by working with each other, our customers and our partners. #PoweringProgress
- Grant
- 215.8k employees
- Founded 1907
5
HSBC· London, England, United Kingdom
Opening up a world of opportunity for our customers, investors, ourselves and the planet.We're a financial services organisation that serves more than 40 million customers, ranging from individual savers and investors to some of the world’s biggest companies and governments. Our network covers 58 countries and territories, and we’re here to use our unique expertise, capabilities, breadth and perspectives to open up a world of opportunity for our customers. HSBC is listed on the London, Hong Kong, New York, and Bermuda stock exchanges.To view our social media terms and conditions please visit the following webpage: http://www.hsbc.com/social-TandCs
- Post-IPO debt
- 200.3k employees

6
Unilever· London, England, United Kingdom
Every day, 3.4 billion people around the world enjoy our products - from ground-breaking brands like Hellmann's, Domestos, Dove and Rexona (to name just a few). Our brands lead the way - innovating in their fields, delighting their consumers and powering our business forward. And it is our people who make everything happen. Our bright and curious people who imagine and create the future - diverse, passionate and ambitious people. A role with us means endless opportunities with global brands that make markets and people who play to win. We make markets and create cultures through some of the biggest brands and best-known products in the world. Talented teams in 190 countries redefine the way we do business and set new standards for our brands. Always learning, always innovating. Is this your moment?
- Grant
- 156.6k employees
7
Vodafone· London, England, United Kingdom
At Vodafone, our purpose is to connect everyone. From the seabed to the stars, we provide innovative mobile and fixed connectivity solutions to empower our customers across the globe. And we're constantly expanding coverage to bridge continents and spread inclusion, even in the most remote places. When everyone is connected, we can create a future full of possibilities. Find more information at www.vodafone.com#EveryoneConnected
- post ipo secondary
- 155.7k employees
- Founded 1982
8
G4S· London, England, United Kingdom
G4S is a leading security and facility services company that provides proactive security services and cutting-edge smart technology to deliver tailored, integrated security solutions that allow clients to focus on their core business. Through a global workforce of approximately 800,000 people, we leverage best practices in communities all over the world. With revenues at approximately $20 billion, we are supported by efficient processes and systems that can only come with scale to help deliver our promise locally: keeping people safe so our communities can thrive. For more information on G4S, visit www.g4s.com.
- Post-IPO equity
- 117.4k employees
- Founded 1901
9
Aon· London, England, United Kingdom
We exist to shape decisions for the better — to protect and enrich the lives of people around the world. Through actionable analytic insight, globally integrated Risk Capital and Human Capital expertise, and locally relevant solutions, our colleagues provide clients in over 120 countries with the clarity and confidence to make better risk and people decisions that help protect and grow their businesses.
- Post-IPO debt
- 94.4k employees
- Founded 1979
10
ANY Company· London Colney, England, United Kingdom
ANY CompanyBuild stronger connections! Build smarter, build faster!We know is Not just any company, is your company and is safe with us. No matter the size of your business you can now promote your company or find a partner within Any company channel. With ANY Company, you can renew your connections, find new parteners, new available markets and everithing that matters to save your start-up or to keep your company on top of the companies world. Digital media is an increasing source of entertainment, news and social interaction, and customers are now exposed not just to what your company says about your brand, but what the media, friends, relatives, coworkers etc., are saying as well. And they are more likely to trust them than you. Customers want companies they can trust, companies that know them, personalized interactions and offers tailored solutions to their needs and preferences.
- 94.4k employees
- Founded 2018

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Find engineers and operators at companies in London

London is one of the densest markets for technology talent in the world. The list above ranks the largest companies headquartered in London by current headcount, drawn from public LinkedIn and Crunchbase records. With 33,376 matching companies in Refolk’s index, the depth of engineers, designers, product managers, and founders is broad across stages and industries.

Hiring in London usually means hiring out of these companies. The biggest names anchor the talent pool - every senior engineer in London likely has at least one of them on their resume - and the fast-growing ones generate the most movement.

Refolk lets you reach into this pool with plain English. Ask for “senior backend engineers in London who’ve shipped at scale” or “founders in London who left in the last year” and Refolk returns a ranked shortlist with the evidence behind each match.

How this list is built

Refolk pulled the largest companies headquartered in London from public LinkedIn and Crunchbase records, ranked them by current employee count, and kept those with at least 25 employees. The list refreshes once a day.

Last refreshed: Wed, 05 Aug 2026 21:44:54 GMT

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How is this ranking built?

The list draws on the public company graph - headcount and growth signals, funding history, and recency. The criteria chips at the top show exactly which filters produced it, and the methodology section explains the ranking.

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The underlying index updates continuously and this page re-renders at least daily. Last refreshed: Wed, 05 Aug 2026 21:44:54 GMT.

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